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After an unusual seven-week lapse in executions in the USA since a botched effort in Oklahoma on April 29, two men could face lethal-injection deaths in Georgia and Missouri Tuesday night and early Wednesday morning.

Should the execution of Marcus Wellons go forward Tuesday in Georgia, it would be that state's first lethal injection using a drug not federally approved. That's the result of a scramble by Georgia and other states in recent months to obtain drugs necessary for executions.

Wellons, 59, was sentenced to death for the 1989 rape and murder of 15-year-old India Roberts, whom he abducted as she was on her way to meet a school bus.

At 12:01 a.m. Wednesday, Missouri is preparing to execute John Winfield, who blinded the mother of his two children and killed two other women in a 1996 shooting spree. A stay of execution issued in that case was lifted late Tuesday.

Lawyers for both Wellons and Winfield sought last-minute postponements from the U.S. Supreme Court.

A third inmate in Florida, John Henry, is slated to be put to death Wednesday evening.

Wellons' case gained notoriety when defense lawyers unsuccessfully attempted to have the conviction thrown out in 2012 on grounds that jurors in his trial acted improperly by giving as gifts to the trial judge and a bailiff erotically shaped chocolate.

Attorneys for Wellons are moving to block his execution on grounds similar to those raised in other states, arguing that Georgia's secrecy surrounding the barbiturate it plans to use violates the condemned prisoner's constitutional rights.

Georgia has joined a host of other death penalty states scrambling to find necessary drugs for carrying out lethal injections after federally approved manufacturers have elected in recent years to no longer sell their pharmaceuticals for use in executions.

Wellons' lawyers argue that Georgia intends to use an overdose of pentobarbital produced by a compounding pharmacy and not a federally approved manufacturer. Compounding pharmacies, which mix drugs to order, are not heavily regulated. Similar legal grounds were raised in the Oklahoma execution of Clayton Lockett in late May.

That execution went awry and witnesses watched in horror as Lockett struggled against his restraints after drugs were administered. He writhed, groaned and attempted to speak before the execution chamber curtains were drawn to keep witnesses from seeing more. The execution was halted, but Lockett died 43 minutes after the process began, reportedly from a heart attack.

Oklahoma Gov. Mary Fallin ordered an investigation. Meanwhile, an independent autopsy performed by a forensic pathologist hired by defense lawyers found that executioners had repeatedly struggled to insert intravenous needles into Lockett's arms and groin, even though he had healthy veins.

Since that flawed execution, no others have taken place, and several have been delayed by legal challenges.

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